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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47eabe4684caebbaaff122366e9fd2397a43902cb83696391939ce3444507f2' 
  AND token = '437iP+uETh6GZyGCuBT4360BbN6FKCjvMd/hhxTcQFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}